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A noninvasive EEG biofeedback system based on virtual reality (VR) environment is developed. The system translates EEG signals into movement and interaction. VR environment provides an ideal medium to represent the spatial and temporal nature of electrical activity emanating from the brain. The VR environment is developed based on MS DirectX technique.(More)
Based on the H.264/AVC Video coding standard, a new video steganography algorithm is proposed and realized in this paper. The algorithm designed a motion vector component feature to control embedding, and also to be the secret carrier. The information embedded will not significantly affect the video sequence's visual invisibility and statistical(More)
Industrial computed tomography (ICT) systems have widely applied in many important industrial areas for nondestructive testing (NDT) and non-destructive evaluate (NDE). A software system on 3D image visualization and analyzing for industrial CT is developed. This system is built on the frame that based on data flow model, and with the modules such as data(More)
With the development of technology, intelligent robots will play an important role in our daily life. More and more intelligent robots based on embedded systems are used for security, detection, service, etc. Interaction with human is an important part of intelligent robots. Hand gesture is a convenient and fast method for human-robot interactions. In this(More)
Non-negative matrix factorization (NMF) is an algorithm that is able to learn a parts-based representation. The paper proposes a new spontaneous EEG classification method for attention-related tasks. NMF was employed as feature extraction tool, which leads to more localized and sparse features than other two reference methods: power spectrum method and(More)
In view of students' individual difference in the learning process, in this paper we propose a personalized learning system, to which intelligent Agent technique and case-based reasoning mechanism are both applied, then we present a network learning environment based on mobile Agent and illustrate the environment's structure, working process, reasoning(More)
AIMS We previously demonstrated that resveratrol (RSV) administration causes cardiac stromal cell-derived factor (SDF)-1 upregulation and can enhance the mobilization of stem cells in mice with acute myocardial infarction (AMI). However, the upstream signal transduction involved in SDF-1 regulation in the setting of AMI and RSV administration remains(More)
OBJECTIVE To study the effects of pulsed ultrasound (PUS) and pulsed electromagnetic fields (PEMF) on the secretion of extracellular matrix from a culture complex during in vitro chondrogenesis. METHODS All the rat bone marrow mesen- chymal stem cell pellets were cultured in achondrogenic medium. Different intensities of PUS (100, 150, and 200 mW · cm⁻²)(More)
The Lyapunov exponent is an important index reflecting dynamic characteristics of nonlinear systems. In order to study the value of the largest Lyapunov exponent on diagnosing the arterial stenosis in various degrees, we acquired the blood flow signal on the healthy and stenotic internal carotid arterial in white rabbits by transcranial Doppler ultrasound(More)
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